JP2020069063A - Flow rate control valve in negative pressure wet type pre-operation sprinkler equipment - Google Patents

Abstract

To reduce a sound of collision between a piston part and a cylinder part, and increase a degree of adhesion when the piston part and the cylinder part are brought into close contact with each other.SOLUTION: A flow rate control valve 1' in negative pressure wet type pre-operation sprinkler equipment having a piston part 6 provided so as to move forward by the pressure of water is brought into close contact with an inner surface side of an end closed part of a cylinder part 2 by moving to the most advanced position against energizing force of a coil spring 11 by the pressure of flowing-in water, and restricts a flow rate. When the piston part 6 is brought into close contact with the closed part 6' at the most advanced position, impact is absorbed by an elastic buffer material 13 installed in the piston.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD The present invention relates to a flow control valve in a negative pressure wet pre-operation sprinkler facility in which water is filled in the secondary side pipe and is in a negative pressure state except when a fire occurs.

  As a conventional fire extinguishing facility, it has the function of preventing water leakage in the event of damage to the sprinkler head, and having the function of promptly discharging water in the event of a fire. There is a negative pressure wet pre-actuated sprinkler facility that puts it in a negative pressure state.

  FIG. 8 is a schematic configuration diagram of such a negative pressure wet pre-actuated sprinkler facility. In the figure, 100 is a negative pressure wet pre-actuated sprinkler facility.

  Reference numeral 101 is a primary-side pipe that is erected from the fire-extinguishing water tank 102 via a water supply pump 103 to be piped. Reference numeral 104 denotes a secondary side pipe connected to the primary side pipe 101 and connected to the sprinkler head 105.

Reference numeral 106 denotes a pre-operation type running water detection device which is installed between the primary side pipe 101 and the secondary side pipe 104 and maintains a closed state except when a fire occurs. A fire detector 107 is installed on the ceiling and detects a fire and sends out a fire signal.

Reference numeral 108 connects one end side 108A to the secondary side pipe 104, and connects the other end side 108B to an intake pipe 110 rising from a vacuum pump 109 and piping, and a drain pipe 111 whose lower end hangs down to the fire extinguishing water tank 102. Is a suction tube connected to.

Reference numeral 112 designates a small flow amount, which is installed in the middle portion of the suction pipe 108 when the negative pressure state in the secondary side pipe 104 is normally monitored, and a large flow amount when the pipe is damaged or the sprinkler head is damaged. It is a flow control valve that is sometimes closed. Further, the flow control valve 112 is an automatic valve with an orifice shown in FIGS. 9 and 10, and there is a direct acting solenoid valve having a diameter of 40A. And as another example, the rating is 24 VDC, 1,580 mA.

Further, as shown in FIG. 9, the flow rate control valve 112 has an automatic valve with an orifice from the opening 112a on the inlet side when the negative pressure in the secondary pipe 104 is normal (slow pressure rise). A small amount of the water-containing air that has flowed into the main body passes through the orifice (small hole) 112A as indicated by the arrow so that a small amount of the air flows into the outlet-side opening 112b. Further, when the negative pressure state in the secondary side pipe 104 is abnormal (pressure rapidly rises), as shown in FIG. 10, the valve body 112e is lifted and opened by energization via the electromagnetic coil 112c and the plunger 112d. A large amount is made to flow to the outlet side opening 112b through the original flow path 112B.

Further, in FIG. 8, reference numeral 113 denotes a vacuum switch which is installed at a position on the secondary pipe 104 side of the flow control valve 112 in the middle of the suction pipe 108 and detects a pressure in the secondary pipe 104.

  Reference numeral 114 denotes a signal receiving board that receives a fire signal from the fire detector 107 when a fire occurs and transmits the signal to a control board described later.

  115 receives a signal from the signal receiving board 114, opens the pre-operation type water flow detection device 106 to bring the primary side pipe 101 and the secondary side pipe 104 into communication with each other, and connects the water supply pump 103 to the water supply pump 103. It is a control panel to operate. In addition, in the other figures, 116 is installed in the connecting portion of the intake pipe 110 to the suction pipe 108, and 117 is installed in the connecting portion of the suction pipe 108 between the intake pipe 110 and the drain pipe 111. It is a check valve.

  At times other than when a fire occurs, both the primary side pipe 101 and the secondary side pipe 104 are filled with water, and the inside of the secondary side pipe 104 is vacuum pumped via a suction pipe 108 and an intake pipe 110. A negative pressure state is set at 109.

  When a fire occurs, the fire detector 107 detects the fire and sends a fire signal to the signal receiving board 114, and then the signal receiving board 114 sends the signal to the control board 115. Upon receiving the signal, the control panel 115 opens the pre-operation type water flow detection device 106 and operates the water supply pump 103. As a result, water is continuously discharged from the sprinkler head 105. At that time, the automatic valve with an orifice, which is the flow control valve 112, is in the normal state shown in FIG. 9, and the operation of the vacuum pump 109 is stopped.

The conventional negative pressure wet pre-actuated sprinkler equipment is as described above. However, such equipment has a problem in a configuration for properly maintaining the negative pressure state in the secondary side pipe. This is because an automatic valve with an orifice is used as the flow rate control valve 112 installed in the middle of the suction pipe 108.

  Thus, such an automatic valve with an orifice is a solenoid valve, and such a solenoid valve has the advantage that the control method is simple, such as closing when not energized and opening when energized, while consuming less current. The power supply is large and must continue to be energized while the valve body is open, which requires a large power supply. As described above, the automatic valve with an orifice used in the conventional equipment is a direct acting solenoid valve having a diameter of 40A, and as an example, the rating is 24V DC, 1,580mA. However, the current consumption is large and a large power source is required to open the valve body.

Further, the conventionally used solenoid valve has a large current consumption as described above and requires a large power source to open the valve body, so that there is a problem at the time of power failure. That is, at the time of a power failure, the pressure in the secondary side pipe may suddenly rise due to damage to the secondary side pipe, etc., and it may be necessary to open the valve. It was necessary to take measures such as installing or supplying power from emergency power supply facilities. However, when a storage battery having a large capacity is provided, not only the size of the storage battery itself, but also the size of the control panel for storing the storage battery is increased and the cost is increased. In addition, when power is supplied from the emergency power supply facility, it is necessary to estimate the power supply capacity in advance when designing the emergency power supply facility, and there is a problem that the facility cannot be renewed.

Therefore, the present inventor, in the above negative pressure wet pre-actuated sprinkler equipment, does not require electric power to replace the conventional automatic valve with an orifice, which consumes a large amount of electric power, as a flow control valve for properly maintaining the pressure in the secondary side pipe used for the equipment. The flow control valve of was devised earlier. By using this, it has become possible to eliminate the above-mentioned conventional problems.

Thus, the flow control valve previously devised by the present inventor is as shown in FIGS. 6 and 7. In the figure, 1 is a flow control valve. 2, both ends are closed 2A, 2B, and air containing water flowing in from an inlet 3 provided at one end side surface and an outlet 4 provided at a closed portion 2B at the other end and the flow It is a cylinder portion that is connected to the inside of the outlet 4 and flows out from an opening 5 having a smaller diameter than the outlet 4. The inflow port 3 provided on the side surface of the one end portion of the cylinder portion 2 is provided in the cylinder portion 2 itself, and although not shown, the closed portion 2A of the one end portion of the cylinder portion 2 is enlarged. It may be provided in this case. Reference numeral 6 denotes a piston portion provided in the cylinder portion 2 so as to be able to move forward by the pressure of water. The piston portion 6 is moved to the most advanced position against the urging force of a coil spring described later by the pressure of the inflowing water, thereby closing the closed portion. Is in close contact with the inner surface of the closed portion 2B of the cylinder portion 2. The piston portion 6 has a cylindrical shape with one end closed 6 ', and a flange portion 6A having an outer diameter equal to the inner diameter of the cylinder portion 2 is formed at the other end, so that the cylinder portion of the closed portion 6'is In the state where the closed portion 6 ′ of the piston portion 6 is in close contact with the closed portion 2 B of the other end of the cylinder portion 2 on the surface facing the closed portion 2 B of the other end of the portion 2, both closed portions 6 'A groove 7 is formed between the outer periphery of the piston portion 6 and the opening 5 of the closed portion 2B of the cylinder portion 2 between the 2'and 2B, and the cylindrical portion has a large diameter. The opening 8 is provided.

Reference numeral 9 is an inspection rod slidably inserted into a closed portion 2A at one end of the cylinder portion 2, and the piston portion 6 is provided in the cylinder portion 2 against the biasing force of a coil spring described later. It pushes to the most forward position. Further, the inspection rod 9 has one end portion on the front side connected to the closed portion 6 ′ of the piston portion 6. Further, a stopper 9B for restricting the retracted position is formed at a substantially central portion of the inspection rod 9 in the axial direction, and the other end on the rear side protruding from the closed portion 2A on one end of the cylinder portion 2 is also formed. The portion is formed with a flange portion 9A protruding and retracting from a closed portion 2A of the cylinder 2 to a tubular portion 10 projecting so as to surround the inspection rod 9.

Reference numeral 11 denotes a coil spring that is contracted between the flange portion 9A of the inspection rod and the closed portion 2A of the cylinder portion 2, and pushes and urges the piston portion 6 toward the retracted position via the inspection rod 9. It is a thing.

The elastic force (spring constant) of the coil spring 11 is such that when water is supplied from the primary side pipe 101 into the secondary side pipe 104 at the time of a fire, part of the water flows into the suction pipe 108. It needs to be reduced only by the pressure. Therefore, the water flows in from the inflow port 3, and the piston portion 6 is moved forward while the pressure exceeds the biasing force of the coil spring 11. Although not shown, the coil spring 11 may be provided between the flange portion 6A of the piston portion 6 and the closed portion 2B at the other end of the cylinder portion 2.

Further, the cylindrical portion 10 and the flange portion 9A of the inspection rod 9 constitute a displacement amount measuring means 12 of the inspection rod, and the protruding end surface 10a of the cylindrical portion 10 and the flange portion 9A of the inspection rod 9 are constituted. The distance L1 from the outer end surface 9A 'corresponds to the mutual distance L2 between the closed portion 6'of the piston portion 6 and the closed portion 2B at the other end of the cylinder portion 2 when the piston portion 6 is in the retracted position. It is arranged to be at intervals. As a result, the movement and position of the piston portion 6 in the cylinder portion 2 can be confirmed from the outside through the movement of the inspection rod 10.

The operation of the flow control valve 1 is as follows.
When there is a slow pressure increase due to volume expansion due to temperature change of the secondary side pipe or minute air inflow from the flow control pipe, etc., except when a fire occurs, the piston part 6 moves backward as shown in FIG. The air containing water, which is located at the position and flows from the inflow port 3 of the cylinder part 2, flows out from the opening 5 and the outflow port 4 of the cylinder part 2 through the large-diameter opening 8 of the piston part 6.

Further, when the sprinkler head or the like is damaged and the pressure in the secondary side pipe rapidly rises, the piston portion 6 is in the same retracted position as in FIG. 6, and the vacuum pump 109 operates. Water leakage is prevented by this suction. At that time, since the suction force of the vacuum pump 109 is lower than the elastic force of the coil spring 11, the piston portion 6 does not move.

Further, when water is supplied from the primary side pipe 101 to the secondary side pipe 104 when a fire occurs and a part of the water flows into the suction pipe 108, as shown in FIG. 7, the pressure of the water causes the coil spring 11 to move. The piston portion 6 moves to the most advanced position against the biasing force, and the closed portion 6 ′ comes into close contact with the inner surface of the closed portion 2 </ b> B of the cylinder portion 2. Further, at this time, the vacuum pump 109 does not operate. As a result, only a small amount of water flows through the groove 7 of the piston portion 6, and sufficient water discharge from the sprinkler head 105 is secured. Although the water continues to flow out from the groove 7 of the piston portion 6, the flow amount from the groove 7 is small, so the influence of the outflow is small.

When the pre-operation type running water detection device 106 is closed after extinguishing the fire, water flows out from the groove 7 of the piston part 6 to reduce the pressure in the secondary side pipe 104, and the piston part 6 is re-energized by the coil spring 11. It is returned to the retracted position.

As described above, the flow control valve 1 operates without requiring electric power.

Further, the flow control valve 1 is also provided with a configuration that can be inspected periodically to confirm the operation of the piston portion 6 without introducing pressurized water.

In such a configuration, when the piston portion 6 is in the retracted position, air containing water flows in from the inflow port 3, and these pass through the large-diameter opening 8 of the piston portion 6 and the opening 5 of the cylinder portion 2. If the state of flowing out from the outflow port 4 continues for a long period of time, calcium or impurities contained in water will be deposited around the piston portion 6 or the inner surface of the cylinder portion 2 or dust will be attached, so that the piston may be damaged when an actual fire occurs. This is to prevent the situation in which the section 6 does not operate normally, which may occur.

Thus, as described above, the configuration is such that the piston portion 6 is moved to the closed portion 2A at one end of the cylinder portion 2 against the urging force of the coil spring 11 in the cylinder portion 2. The inspection rod 9 is pushed out to the forward movement position.

Further, as described above, the cylindrical portion 10 and the flange portion 9A of the inspection rod 9 constitute the inspection rod displacement amount measuring means 12, and the protruding end surface 10a of the cylindrical portion 10 and the flange of the inspection rod 9 are constituted. The distance L1 between the outer end surface 9A 'of the portion 9A and the closed portion 6'of the piston portion 6 when the piston portion 6 is in the retracted position and the closed portion 2B of the other end portion of the cylinder portion 2 are mutually spaced. Since the distance is set to correspond to L2, the movement and position of the piston portion 6 in the cylinder portion 2 can be confirmed from the outside through the movement of the inspection rod 9.

  Although the flow control valve 1 in the negative pressure wet pre-actuated sprinkler equipment devised by the present inventor has the above-described configuration and operation and has the above-described effects, the present inventor further The present invention has been completed as a result of studying from the viewpoint of noise during piston operation and earnestly researching to improve them.

  That is, in the flow control valve 1 previously devised by the present inventor, since the piston portion 6 and the cylinder portion 2 are both metal, when the piston portion 6 is pushed out to the most advanced position by hydraulic pressure, The closed portion 6'and the inner surface of the closed portion 2B of the cylinder portion 2 violently collide with each other, and a large impact sound is generated. Then, this large impact sound is a noise level, which causes annoyance to the surroundings.

Therefore, as a result of further intensive research conducted by the present inventor in order to improve this problem, as a result of providing a shock absorbing function to a portion of the piston portion that collides with the inner surface of the closed portion of the cylinder portion, a shock absorbing function is provided. The present inventors have found that it is possible to achieve a significant reduction, and have completed the present invention. In addition, in addition to this, when the piston portion and the closed portion of the cylinder portion are in close contact with each other, it is possible to obtain better adhesion.

Thus, the gist of the present invention is
A pre-operation type running water detection device and a primary side pipe provided on the primary side of the pre-operation type running water detection device, and a water supply means is connected to the base end side,
A secondary side pipe provided to the secondary side of the pre-operation type running water detection device, to which a sprinkler head is connected, a vacuum pump having a negative pressure in the secondary side pipe, and the secondary side pipe and a vacuum pump are connected. Intake pipe to
Provided at the connection between the secondary pipe and the intake pipe,
A main body through which air and water flowing from the secondary pipe to the intake pipe pass, a piston portion movable forward by the pressure of water in a cylinder portion provided in the main body, and a piston portion retracted It is composed of a coil spring that biases in the moving direction,
The piston part has a cylindrical shape with one end closed, a flange part having an outer diameter equal to the inner diameter of the cylinder part is formed at the other end, and the other end of the cylinder part is closed at the closed part. An opening having a diameter smaller than the opening of the portion is provided, and an opening having a diameter larger than the opening is provided in the cylindrical portion,
The flow rate of the inflowing water so that the closed portion comes into close contact with the inner surface side of the closed portion of the other end of the cylinder portion by moving to the most advanced position against the biasing force of the coil spring. In the control valve,
A flow control valve in a negative pressure wet pre-actuated sprinkler equipment, characterized in that when the piston portion comes into close contact with the front end closed portion at the most advanced position, an elastic cushioning material absorbs close impact.

In addition, in the above-mentioned configuration, the elastic cushioning material may be configured to be installed in the piston portion.

Further, in the above configuration, the piston portion divides a portion of the front end surface thereof from the main body portion of the piston portion, and the divided portion is installed via the elastic cushioning material and is movable in the moving direction of the piston portion. It can be configured to hold.

Further, in the above structure, a groove may be provided in the divided portion on a surface of the piston portion that is in close contact with the closed portion at the most advanced position, and a small amount of flow passage may be formed when the piston portion is in close contact. ..

  The present invention is configured as described above, and divides the piston portion at the portion where the groove is formed on the front end surface thereof from the main body portion of the piston portion, and the divided portion is moved in the moving direction of the piston portion via the elastic cushioning material. Since it is held movably, when the piston part rapidly advances due to water pressure and its front end collides violently with the inner surface of the closed part of the cylinder part, the impact of the collision is cushioned by the elastic cushioning material. Therefore, a large impact sound generated at the time of a collision can be significantly reduced and the noise level can be prevented. Further, since the elastic cushioning material is disposed on the rear surface of the divided portion of the piston portion, the divided portion of the piston portion is pressed from the rear surface side toward the closed portion side of the cylinder portion by the restoring force of the elastic cushioning material. As a result, the degree of close contact between the divided portion of the piston portion and the closed portion of the cylinder portion can be further increased.

It is a vertical side view of the flow control valve in the negative pressure wet pre-actuated sprinkler equipment according to the embodiment of the present invention, and shows a normal state and a state when the sprinkler head is damaged. It shows the state at the time of the fire and at the time of inspection. It is an expansion vertical side view of the piston part. It is an enlarged front view of the division part of the piston part. It is a partial expanded longitudinal cross-sectional view which shows the state at the time of the said fire occurrence and the time of inspection. FIG. 3 is a vertical sectional side view of a flow control valve in a negative pressure wet pre-actuated sprinkler facility devised by the inventor of the present invention in a normal state and when a head is damaged. It shows the state at the time of the fire. It is a schematic block diagram of the conventional negative pressure wet pre-operation sprinkler equipment. It is an operation explanatory view of the automatic valve with an orifice in the conventional negative pressure wet pre-operation sprinkler equipment, and shows a state at the time of a slow rise of the pressure in the secondary side piping. It is an operation explanatory view of the automatic valve with an orifice in the conventional negative pressure wet pre-operation sprinkler equipment, and shows a state at the time of rapid rise of the pressure in the secondary side piping.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  In the figure, 1'is a flow control valve. The flow rate control valve 1 ′ is a negative pressure wet pre-operated sprinkler facility previously devised by the present inventor, except that the front end portion of the piston portion contacts the inner surface of the closed portion of the cylinder portion of the piston portion. It is the same as the flow control valve 1 in FIG. Therefore, the same members are designated by the same reference numerals and detailed description thereof will be omitted.

Thus, the flow control valve 1'in the negative pressure wet pre-operated sprinkler equipment according to the present embodiment has the piston portion 6 in the flow control valve 1 previously devised by the present inventor and the groove 7 in the front end surface thereof. The formed portion is divided from the main body portion of the piston portion 6, and the divided portion is movably held in the moving direction of the piston portion via an elastic cushioning material.

  6B is a portion of the front end surface of the piston portion 6 where the groove 7 is formed and which is divided from the main body portion of the piston portion 6, and is formed separately from the main body portion. Further, 13 is the elastic cushioning member, which is disposed in a recess 14 formed in the front end surface of the main body portion of the piston portion 6. The elastic cushioning material 13 is made of rubber or synthetic resin material, and may be made of any material as long as it is highly elastic and has a high impact absorbing power. It may also be a foam.

Further, the divided portion 6B of the piston portion 6 is disposed outside the elastic cushioning material 13, and is movable in the moving direction of the piston portion 6 with a disc-shaped collar 15 that presses the outer surface of the center portion side. Is held. Reference numeral 6B 'is a step portion formed on the outer surface of the divided portion 6B of the piston portion 6 on the center side, and the step portion 6B' is covered with the outer peripheral edge portion of the disk-shaped collar 15. Has been done.

Further, 16 is a screw for connecting the piston portion 6 and the inspection rod 9, and a screw insertion hole 17 formed in the central portion of the disk-shaped collar 15 and a closed portion of the piston portion 6. 6'is inserted through a screw insertion hole 18 formed in the central portion of the 6'and screwed into a female screw 19 formed on the front end surface of the inspection rod 9. In the present embodiment, the front end of the inspection rod 9 is fitted in the central portion of the closed portion 6'of the piston portion 6.

Next, the operation of this embodiment will be described.
The state at normal times and when the sprinkler head is damaged is as shown in FIG. The state at the time of fire occurrence and at the time of inspection is as shown in FIGS. 2 and 5, and when the piston portion 6 rapidly advances due to water pressure, the front end portion thereof violently collides with the inner surface of the closed portion 2B of the cylinder portion 2. collide. At this time, in the present embodiment, since the elastic cushioning material 13 is disposed on the back surface of the divided portion 6B of the piston portion 6 that collides, the impact of the collision is absorbed by this and is greatly mitigated. As a result, a large impact sound generated at the time of a collision is significantly reduced, and the noise level can be prevented.

Further, in the event of a fire, as shown in FIG. 5, when the divided portion 6B of the piston portion 6 is in close contact with the inner surface of the closed portion 2B of the cylinder portion 2, the inflowing water is the divided portion of the piston portion 6. Only a small amount flows out through the groove 7 of 6B.

Further, in the present embodiment, since the elastic cushioning material 13 is disposed on the back surface of the divided portion 6B of the piston portion 6 which collides with each other as described above, the divided portion 6B of the piston portion 6 has the elastic cushioning material 13 The restoring force of (2) pushes the cylinder portion 2 toward the closed portion 2B side of the cylinder portion 2. This makes it possible to further improve the degree of close contact between the divided portion 6B of the piston portion 6 and the closed portion 2B of the cylinder portion 2 in close contact with each other.

1'Flow control valve 2 Cylinder part 2A, 2B Closure part 3 Inlet port 4 Outflow port 5 Opening 6 Piston part 6'Closing part 6B Dividing part 7 Groove 8 Opening 9 Inspection rod 10 Cylindrical part 11 Coil spring 12 Displacement amount of inspection rod Measuring means 13 Elastic cushioning material 14 Recess 15 Disk-shaped collar 16 Screw

Claims (4)

A pre-operation type running water detection device and a primary side pipe provided on the primary side of the pre-operation type running water detection device, and a water supply means is connected to the base end side,
A secondary side pipe provided to the secondary side of the pre-operation type running water detection device, to which a sprinkler head is connected, a vacuum pump having a negative pressure in the secondary side pipe, and the secondary side pipe and a vacuum pump are connected. Intake pipe to
Provided at the connection between the secondary pipe and the intake pipe,
A main body part through which air and water flowing from the secondary side pipe to the intake pipe pass, a piston part movable forward by the pressure of water in a cylinder part provided in the main body, and a piston part retracted It is composed of a coil spring that biases in the moving direction,
The piston part has a cylindrical shape with one end closed, a flange part having an outer diameter equal to the inner diameter of the cylinder part is formed at the other end, and the other end of the cylinder part is closed at the closed part. An opening having a diameter smaller than the opening of the portion is provided, and an opening having a diameter larger than the opening is provided in the cylindrical portion,
The flow rate of the inflowing water so that the closed portion comes into close contact with the inner surface side of the closed portion of the other end of the cylinder portion by moving to the most advanced position against the biasing force of the coil spring. In the control valve,
A flow rate control valve in a negative pressure wet pre-actuated sprinkler equipment, wherein the piston portion has a structure in which a close shock is absorbed by an elastic cushioning material when the piston portion comes into close contact with the front end closed portion at the most advanced position. The flow control valve in the negative pressure wet pre-actuated sprinkler equipment according to claim 1, wherein the elastic cushioning material is installed in the piston portion. The piston portion has a front end face portion divided from a body portion of the piston portion, and the divided portion is installed via the elastic cushioning member and is movably held in the moving direction of the piston portion. The flow control valve in the negative pressure wet pre-actuated sprinkler equipment according to claim 2. 4. A groove is provided in a surface of the divided portion that is in close contact with the closed portion at the most advanced position of the piston portion, and a small amount of flow path is formed when the piston portion is in close contact with the divided portion. Flow control valve in a negative pressure wet pre-actuated sprinkler facility as described.

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